gender, nationality, country_of_birth, id_document_*, occupation_code) are optional here and become mandatory only for products that declare them (see POST /customers/v1/wallets).{
"first_name": "string",
"last_name": "string",
"email": "user@example.com",
"birthday": "2019-08-24",
"phone_number": "string",
"address": {
"line1": "string",
"line2": "string",
"city": "string",
"state": "string",
"postal_code": "string",
"country": "AUS"
},
"gender": "MALE",
"nationality": "AUS",
"country_of_birth": "AUS",
"id_document_type": "PASSPORT",
"id_document_number": "string",
"id_document_expiry": "2019-08-24",
"id_document_country": "AUS",
"occupation_code": "string"
}